Yazarlar
- Akpolat, Mustafa(2)
- Kök, Baha Vural(2)
- Yilmaz, Mehmet(2)
- Alataş, Taner(1)
- Barros, J.(1)
- Cachim, P.(1)
- El Naggar, H.(1)
- Ozdemir, Ahmet Münir(1)
- Yalcin, Beyza Furtana(1)
- Yalcin, Erkut(1)
- Yalçln, Beyza Furtana(1)
- Yalçın, Erkut(1)
- Yamaç, Özge Erdoğan(1)
- Yllmaz, Mehmet(1)
- Yılmaz, Mehmet(1)
- Çeloğlu, M. Ertuğrul(1)
- Özdemir, Ahmet Münir(1)
Yayınlar
- MakaleAçık Erişim2025Scopus SJRQ3Effect of polymer modification on bitumen rheology: A comparative study of bitumens obtained from different sources
Özdemir, Ahmet Münir; Yalçln, Beyza Furtana; Yllmaz, Mehmet
The rheological and mechanical properties of bituminous binders vary significantly depending on the crude oil source. Consequently, the response of binders from different sources to polymer modification also differs. This study compares the rheological performance of B160/220 penetration-grade binders sourced from the Turkey-Batman and Iraq-Lanaz refineries, modified with styrene-butadiene-styrene (SBS), the most widely used polymer additive. To evaluate high-temperature performance, performance grade and frequency sweep tests were conducted using a dynamic shear rheometer. In addition to experimental assessments, the rheological behavior of the binders was analyzed using the Christensen-Anderson, Cross, and Carreau-Yasuda models. Time-temperature superposition principle master curves were generated to characterize their viscoelastic behavior. Zero shear viscosity (ZSV) values were determined using the Cross and Carreau-Yasuda models to examine the impact of polymer modification on binder viscosity. The findings indicate that the initial rheological properties of bitumen significantly influence its response to SBS modification. For instance, the G∗/sin δvalue increased by up to 199% at 64°C with 4% SBS addition, while the softening point rose by 9.5°C compared to unmodified binders. Modelled ZSV values showed more than a sevenfold increase in some cases, especially in Iraqi binders. On the other hand, at -18°C, the m-value dropped to 0.282 in the B-SBS4 binder, indicating a potential risk of low-temperature cracking. While polymer modification improved the rheological properties of both bitumen types, its effectiveness varied depending on the source.
AtıfScopus8WoS8OpenAlex7
İncele - BildiriAçık Erişim2024Investigation of the Effects of Different Modified Asphalts on Storage Stability
Yalcin, Beyza Furtana; Yilmaz, Mehmet; Yalcin, Erkut; Ozdemir, Ahmet Münir; El Naggar, H.; Barros, J.; Cachim, P.
In this study, the storage stability of modified bitumen prepared with bitumen additives styrene-butadiene-styrene (SBS) and American Gilsonite (AG) was evaluated. For this purpose, modified bitumen was prepared by using different ratios of each additive type. The prepared modified bitumens were subjected to storage stability test according to EN 13399 standard. Penetration, softening point and rotational viscometry tests were performed on the samples subjected to storage stability test. As a result of the penetration and softening point tests of the samples prepared with SBS after storage stability, it was determined that the penetration and softening point values of the samples obtained from the upper part of the tube were higher. This is thought to be due to the accumulation of SBS, which has a lower specific gravity than bitumen, in the upper part of the tube during the storage stability test. Considering the viscosity test results, it was determined that the viscosity values of the modified bitumen samples obtained from the upper part of the tubes were higher than the samples obtained from the lower part of the tubes.
- MakaleAçık Erişim2019Scopus SJRQ1Performance Evaluation of Using Evotherm in SBS Modified Binder
Kök, Baha Vural; Yilmaz, Mehmet; Akpolat, Mustafa
Recently, various types of additives are being used to enhance the properties of bitumen. Until now, few researchers have handled the utilization of different additives in the same binder. In this study, styrene-butadiene-styrene (SBS) and Evotherm were used both separately and in the same blend. Dynamic shear rheometer (DSR) and bending beam rheometer (BBR) tests were applied to SBS and Evotherm modified binders. SBS and Evotherm were added to pure bitumen in three different ratios. Sixteen different combinations were produced using the two additives, and a pure binder in the same binder was evaluated in the DSR test. Eight different combinations were evaluated in the BBR test. The conclusion reached was that the maximum usage of Evotherm (0.9%) induces a 20% reduction in the rutting parameter of both the 5% and 6% SBS modified binders. The 0.5% Evotherm with 4% and 5% SBS modification does not have an adverse effect on rutting performance. Evotherm modification could prevent the stiffness increment that originates from using the SBS additive, especially at high content. Using 0.7% Evotherm with 4% SBS can acquire the pure binder's low temperature performance. (c) 2019 American Society of Civil Engineers.
AtıfWoS11İncele - MakaleAçık Erişim2019Scopus SJRQ2Effect of gilsonite use on storage stability of styrene-butadiene-styrene modified bitumen
Yalçın, Erkut; Çeloğlu, M. Ertuğrul; Akpolat, Mustafa; Yamaç, Özge Erdoğan; Alataş, Taner; Kök, Baha Vural; Yılmaz, Mehmet
Styrene-butadiene-styrene (SBS) polymer is one of the most preferred additives to improve performance in hot mix asphalt pavements. The storage instability, in other words, the separation of a polymer-rich phase from the bitumen-rich phase in the course of storage and transportation is one of the prevalent problems in SBS modified bitumen. The present study attempted to obtain modified bitumen at the same performance level with the SBS modified bitumen, but stable with respect to the storage stability. For this purpose, both SBS and American Gilsonite (AG) were used in modified bitumen production. It was determined that modified bitumen at the same performance level was obtained with the use of 5 % SBS or 18 % AG in bitumen modification. It was also determined that the performance levels of the modified bitumen obtained with the use of 2 % SBS + 13 % AG, 3 % SBS + 10 % AG and 4 % SBS + 6 % AG were similar. Additionally, 2 %, 3 % and 4 % SBS modified bitumen were used for the assessment of storage stability properties of the SBS modified binders. These 8 different modified bitumen samples were tested for storage stability based on the EN 13399 standard. Penetration, softening point, rotational viscometer, bending beam rheometer, and dynamic shear rheometer tests were conducted on the samples. Based on all conducted tests, it was determined that more stable binders were obtained with the use of AG and SBS in terms of storage stability compared to solely SBS modified bitumen.
AtıfScopus18WoS15OpenAlex15İncele